package com.sky.controller.user;

import com.sky.constant.StatusConstant;
import com.sky.entity.Dish;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.concurrent.TimeUnit;

@RestController("userDishController")
@Slf4j
@RequestMapping("/user/dish")
public class DishController {
  // 构造函数方式注入
  private final DishService dishService;
  private final RedisTemplate redisTemplate;
  
  public DishController(DishService dishService, RedisTemplate redisTemplate) {
    this.dishService = dishService;
    this.redisTemplate = redisTemplate;
  }
  
  /**
   * 根据分类id查询菜品
   * @param categoryId
   */
  @GetMapping("/list")
  public Result<List<DishVO>> list(Long categoryId) {
    String key = "dish_" + categoryId;
    // 查询Redis中是否存在改分类菜品数据
    List<DishVO> list = (List<DishVO>) redisTemplate.opsForValue().get(key);
    
    // 如果存在，直接返回，无需查询数据库
    if(list != null && list.size() > 0) {
      return Result.success(list);
    }
    
    Dish dish = new Dish();
    dish.setCategoryId(categoryId);
    dish.setStatus(StatusConstant.ENABLE); // 查询起售中的菜品
    
    // 如果不存在，再查询数据库，将查询到的数据放入Redis中 缓存5min
    list = dishService.listWithFlavor(dish);
    redisTemplate.opsForValue().set(key, list, 5, TimeUnit.MINUTES);
    return Result.success(list);
  }

}
